Asteroids 19V2000

jimk

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I have an Asteroids upright with a V2000 monitor that is experiencing some blooming type behavior. Basically, when I first turn the game on the picture is fine, than slowly over a period of an hour or more the picture grows by a few inches.

The monitor has been recapped, HV diode replaced (twice), pins reflowed all connections cleaned yet the problem still exist. I've also tried the monitor in another cabinet with different boards and using freeze spray to pinpoint the bad component with no luck.

Any ideas what could be causing this behavior?
 
Same problem on mine, I wound up replacing all the transistors, and diodes in the HV cage, and instead of relying on the springs to make contact the HV diode, I soldered it in place.

Sometimes those transistors, and diodes on the HV board will develop leakage.

Also did you check your +B or HV?

I've personally never had to replace a flyback on one, but it's possible that might be causing your problem.
 
I haven't checked the HV readings at all. I'll do some probing on it today and find out if it is changing. Also, the HV diode is soldered to the wire coming of the flyback.

Thanks for the responses.
 
2000

It is obviously a problem in the HV section. The voltage is not staying where it should. If it only grew vert or horiz, I would check the game board X,Y pots.

The transistors that limit the current would be my guess.
 
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